Contactors
All electric motors have a lifespan, and to keep them running efficiently and safely they must be protected. One of the main causes of failure is electrical overload, sometimes called overcurrent. When a motor draws more current than it is designed to handle it causes the temperature to build-up resulting in overheating. This damages motor windings and coils. It is important to protect the motor and its circuit, and this is where the use of contactor overload relays can help.RS Components offer an extensive range of high-quality contactor overload relays from leading industry brands including Schneider Electric, Siemens, ABB, Eaton, Lovato, and Rockwell Automation.What is overload protection?Overload is where a motor draws a high current above its rated value for an extended amount of time. Overload causes overheating of the motor causing damage. To prevent this from happening devices such as contactor relays are specifically designed for industrial control motor protection. They are used with contactors as part of a motor starter or in a control panel or centre.What are the different types of contactor overload relays?The motor protection devices can be classified into two main types which are thermal types and electronic types.Thermal overload relaysUtilise a bi-metallic plate located near a heating element. When excessive current is passed through the heating element N/C (Normally Closed) contacts switch over and opens contacts. This interrupts power from flowing to the contactor’s control circuit. Thermal overloads usually offer an adjustable current range as well as a manual or automatic reset option.Electronic RelaysElectronic overload relays don’t have a bi-metallic mechanism, Instead, they work by using components such as temperature sensors to measure the load current. They are generally more accurate than thermal devices and they usually have a wider current range, a selectable trip class provides enhanced trip protection against single phasing against the motor.
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Siemens Sirius Innovation Auxiliary Contact - 1NC + 2NO, 3 Contact, Snap-On, 6 A ac, 10 A dc
VND631,345.44 -
Phoenix Contact Motor Protection Circuit Breaker -
VND633,839.36 -
Eaton Auxiliary Contact - 1NC + 1NO, 2 Contact, Side Mount, 2 A dc, 3.5 A ac
VND634,031.20 -
ABB Auxiliary Contact - 1NC + 3NO, 4 Contact, Front Mount, 6 A
VND637,292.48 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND637,292.48 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND637,292.48 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND637,292.48 -
Eaton Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 4 A ac, 10 A dc
VND645,541.60 -
Eaton Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND656,284.64 -
Siemens Sirius Innovation Contactor Surge Suppressor for use with SIRIUS Contactors
VND658,778.56 -
Schneider Electric Auxiliary Contact - 2NO, 2 Contact, 12 A
VND659,354.08 -
Siemens Sirius Innovation Auxiliary Contact - 1NC + 1NO, 2 Contact, Snap-On, 6 A dc, 10 A ac
VND661,080.64 -
Schneider Electric TeSys Auxiliary Contact Block - 1NC + 3NO, 4 Contact, Front Mount, 10 A
VND661,656.16 -
Schneider Electric Auxiliary Contact - 2NO, 2 Contact, Front Mount
VND662,615.36 -
Schneider Electric Auxiliary Contact Block - 1NO + 3NC, 4 Contact, Front Mount
VND664,917.44 -
Eaton Auxiliary Contact - 4NO, 4 Contact, Front Mount, 4 A ac, 10 A dc
VND664,917.44 -
Schneider Electric TeSys K LC1K 3 Pole Contactor - 6 A, 230 V ac Coil, 3NO, 2.2 kW
VND666,644.00 -
Eaton Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND668,754.24 -
Eaton Auxiliary Contact - 4NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND668,754.24 -
Eaton Surge Suppressor for use with DILK12 to DILK25 Series, DILM17 to DILM32 Series, DILMP32 to DILMP45 Series
VND675,852.32 -
Schneider Electric TeSys Auxiliary Contact - 1NC + 1NO, 2 Contact, Side Mount, 6 A
VND680,648.32 -
Schneider Electric Link for use with LC Series
VND687,362.72 -
ABB Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 6 A
VND687,746.40